I'm guessing that the fall didn't actually do that much damage. His sword seems to have come through with no issues, sinking into the ground...so it likely wasn't much more than 40-ish points. (Assuming objects take half damage, and the sword's made out of starmetal, which = adamantine, IIRC) At their level, 40ish points really isn't that much damage.
Of course, resurrection is pretty common in the world; if you recall the backstory collection, Roy's dad was ressed, oh, a good half dozen times.
Brad